What if the stool test is abnormal?
The stool test cannot tell whether blood is from the colon or from other parts of the digestive tract. If this test is positive for the presence of blood, additional testing such as a colonoscopy is usually needed to determine the source of the blood. If polyps or other abnormalities are found (such as a tumor), they are removed and then sent to a lab to be tested to see if they are cancerous.
